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An improved low-voltage ride-through control method for doubly-fed induction generators

A low-voltage ride-through, doubly-fed induction technology, applied in motor generator control, electronic commutation motor control, control generator and other directions, can solve the problems of long demagnetization process of stator flux linkage and poor control characteristics, so as to avoid positive The operation of the negative sequence separation, the improvement of the control characteristics, the effect of simplifying the algorithm program

Active Publication Date: 2019-05-31
ZHEJIANG WINDEY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of the existing doubly-fed induction generator low-voltage ride-through control method, the stator flux demagnetization process is too long and the control characteristics are poor. Process control characteristics of an improved doubly-fed induction generator low-voltage ride-through control method

Method used

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  • An improved low-voltage ride-through control method for doubly-fed induction generators
  • An improved low-voltage ride-through control method for doubly-fed induction generators
  • An improved low-voltage ride-through control method for doubly-fed induction generators

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings.

[0042] refer to figure 1 with figure 2 , an improved doubly-fed induction generator low-voltage ride-through control method, a stator damping resistance switching device is added between the doubly-fed induction generator stator and the grid, and the stator damping resistance switching device is composed of a bidirectional thyristor and a damping resistor Parallel connection; during normal grid-connected operation, the bidirectional thyristor is driven to conduct, and the stator current is injected into the grid through the thyristor; when the grid voltage drops, the thyristor is disconnected, and the stator side is connected to the grid through a damping resistor;

[0043] The rotor current loop in the positive sequence synchronous rotating coordinate system and the parallel structure current loop controller are adopted.

[0044] Further, in the stator damping resi...

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Abstract

The invention provides an improved double-fed induction generator low voltage traverse control method. A stator damping resistor switching device is added between a double-fed induction generator stator and a power grid. The stator damping resistor switching device is formed by connecting a bi-directional thyristor and a damping resistor in parallel. During normal grid-connected operation, the bi-directional thyristor is driven to switch on, and stator current is injected into the power grid through the thyristor. When the power grid voltage drops, the thyristor is disconnected, and the stator side is grid-connected through the damping resistor. A current loop controller with a rotor current loop and a parallel structure in a positive sequence synchronous rotating coordinate system is used. The improved double-fed induction generator low voltage traverse control method provided by the invention accelerates a stator flux linkage demagnetization process and improves the control characteristic of a unit in a low voltage traverse process.

Description

technical field [0001] The invention relates to a control method for a doubly-fed induction generator, in particular to a low-voltage ride-through control method for a doubly-fed induction generator. Background technique [0002] With the continuous increase of wind power penetration rate, a large number of units cut off from the grid will lead to a serious imbalance in the active power and reactive power of the grid, and the resulting disturbance will degrade the stability of the entire grid. The fault developed into multiple faults. Therefore, the wind power grid-connected guidelines require that when the grid voltage drops sharply, the wind turbines must maintain grid-connected operation and provide a certain amount of reactive power support to the grid to help the grid voltage rise and then help the grid voltage to recover; at the same time, when the grid voltage recovers Finally, the wind turbines must be able to quickly return to normal operation and output active pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/48H02J3/50H02P21/22
CPCH02J3/386H02J3/48H02J3/50Y02E10/76
Inventor 赵豆豆许国东杨靖陶钧炳韩小良邱纪星史立勤李旭峰李庆贺敬
Owner ZHEJIANG WINDEY
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